<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        input:checked+.box {
            display: block;
        }

        .box {
            width: 100px;
            height: 100px;
            background-color: khaki;
            display: none;
        }
    </style>
</head>

<body>
    <!-- <input type="radio" /> -->
    <label>
        <input type="checkbox" />显示
        <div class="box"></div>
    </label>
</body>

</html>